Multiple language in laravel

I want to use two language in my web application for that i have created this dropdown in my view:

 @if ( Config::get('app.locale') == 'en')
 <li><a class="dropdown-item" href="">Arabic</a></li>
 @elseif ( Config::get('app.locale') == 'ar' )
 <li><a class="dropdown-item" href="">English</a></li>
 @endif

web route:

    Route::get('setlocale/{locale}', function ($locale) {
        if (in_array($locale, \Config::get('app.locales'))) {
          session(['locale' => $locale]);
        }
      
        return redirect()->back();
    });

 Route::get('contact', 'ContactController@index')->name('contact');
 Route::get('home', 'HomeController@index')->name('home');

config/app.php

'locale' => 'en',

'locales' => ['ar', 'en'],

Middleware:

<?php

namespace App\Http\Middleware;

use Closure;
use App;
use Config;
use Session;
use Illuminate\Http\Request;

class Locale
{
    /**
   * Handle an incoming request.
   *
   * @param  \Illuminate\Http\Request  $request
   * @param  \Closure  $next
   * @return mixed
   */
   public function handle($request, Closure $next)
   {
     
     //$raw_locale = Session::get('locale');
     $raw_locale = $request->session()->get('locale');
     if (in_array($raw_locale, Config::get('app.locales'))) {
       $locale = $raw_locale;
     }
     else $locale = Config::get('app.locale');
       App::setLocale($locale);
       return $next($request);
   }
}

when i click on dropdown the language changes but the url is still same i want on initial load of my application if url is testsite.com then it should be by default testsite.com/en if we visit on any page i want that language appended in the url like if i go to contact then it should be testsite.com/en/contact.Same language should be appended to url if i change from dropdown but presently language is not being appended. This language should be prefixed on frontend url only not on backend url (Admin). Any solution Thanks

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